Display panel and display device

ABSTRACT

A display panel and a display device are provided. The display panel includes a pixel definition layer and an encapsulation layer. The pixel definition layer is provided with a plurality of concave portions, the encapsulation layer is provided on the pixel definition layer, the encapsulation layer is provided with a plurality of convex portions, and the convex portions and the concave portions are fitted with each other to form an interlocking structure, so as to improve an adhesion between the encapsulation layer and the pixel definition layer. Therefore, a risk of film debonding and separation among the encapsulation layer, the pixel definition layer, and the functional layer is reduced.

FIELD OF DISCLOSURE

The present disclosure relates to displays, and more particularly to a display panel and a display device.

BACKGROUND OF DISCLOSURE

In recent years, organic light emitting diode (OLED) display technology has received more and more attention. OLED display technology has characteristics of lightness and thinness, wide viewing angle, low power consumption, high speed, and flexible display, which gradually replaces liquid crystal display (LCD) technology and becomes a mainstream display technology. Since the light emitting layer in the OLED display panel with a light emitting function is very sensitive to external environmental factors such as water vapor and oxygen, a performance of the device will drop sharply or be completely damaged if the OLED display panel is exposed to water vapor or an oxygen environment. In order to improve a service life of the OLED and the stability of the device, it is necessary to isolate the surrounding water vapor and oxygen through an encapsulation layer.

Due to a weak adhesion among the encapsulation layer, the pixel definition layer, the cathode, and the light emitting layer, a problem of film debonding and separation among the encapsulation layer, the pixel definition layer, cathode, and light emitting layer is prone to occur. As a result, an ability of the encapsulation layer to block water vapor and oxygen is reduced, which affects a performance of the OLED device, and further affects the display effect and service life of the OLED display panel.

From above, an existing display panel has a problem of film layer separation among the encapsulation layer, the pixel definition layer, and the functional layer. Therefore, it is necessary to provide a display panel and a display device to improve this defect.

SUMMARY OF DISCLOSURE

An embodiment of the present application provides a display panel and a display device, which are used to solve a problem of film layer separation among an encapsulation layer, a pixel definition layer, and the functional layer in an existing display panel.

An embodiment of the present application provides a display panel, and the display panel includes:

-   -   a pixel definition layer provided with a plurality of concave         portions; and     -   an encapsulation layer disposed on the pixel definition layer,         wherein a side of the encapsulation layer close to the pixel         definition layer is provided with a plurality of convex portions         corresponding to the plurality of concave portions, and the         convex portions and the concave portions are fitted with each         other to form an interlocking structure.

According to an embodiment of the application, an aperture of each of the concave portions gradually increases in a thickness direction of the display panel; or the aperture of each of the concave portions first gradually increases and then gradually decreases, and a size of the convex portions is adapted to the aperture of the concave portions.

According to an embodiment of the application, in a thickness direction of the display panel, a depth of the concave portions is less than or equal to a thickness of the pixel definition layer.

According to an embodiment of the application, the display panel further comprises a flat layer disposed on a side of the pixel definition layer away from the encapsulation layer, and the flat layer is provided with a plurality of extension portions corresponding to the plurality of concave portions, wherein:

-   -   in the thickness direction of the display panel, the concave         portions penetrate the pixel definition layer; the extension         portions and the concave portions communicate with each other at         an interface between the pixel definition layer and the flat         layer; and the convex portions, the concave portions, and the         extension portions are fitted with each other to form the         interlocking structure.

According to an embodiment of the application, in the thickness direction of the display panel, a depth of the extension portions is less than or equal to a thickness of the flat layer.

According to an embodiment of the application, the display panel further comprises a display area and a non-display area surrounding the display area, and a plurality of the concave portions are at least arranged on a peripheral edge of the display area close to the non-display area.

According to an embodiment of the application, a plurality of light emitting units distributed in an array are arranged in the display area, and the concave portions is arranged at least partly between the adjacent light emitting units.

According to an embodiment of the application, the light emitting units include a red light emitting unit, a green light emitting unit, and a blue light emitting unit, and the red light emitting unit and the blue light emitting unit and the green light emitting unit have different areas, wherein on a plane where a side surface of the pixel definition layer close to the encapsulation layer is located, an opening area of the concave portions is greater than or equal to a minimum value of an area of the red light emitting unit, the green light emitting unit, and the blue light emitting unit, and is less than or equal to a maximum value of the area of the red light emitting unit, the green light emitting unit, and the blue light emitting unit.

According to an embodiment of the application, on the plane where the side surface of the pixel definition layer close to the encapsulation layer is located, a ratio of the opening area of the concave portions to the maximum value of the area of the red light emitting unit, the green light emitting unit, and the blue light emitting unit is greater than or equal to 0.25 and less than or equal to 1.

According to an embodiment of the application, one of the concave portions is provided between adjacent light emitting units; or, the plurality of concave portions are distributed continuously or at intervals between the adjacent light emitting units.

According to an embodiment of the application, the non-display area is provided with the plurality of concave portions on a periphery of the display area.

According to an embodiment of the application, in a direction in which a center of the display area points to the non-display area, at least one of a density of the plurality of concave portions, an opening size of the plurality of concave portions in the plane where the pixel definition layer is located, or a depth of the plurality of concave portions in a thickness direction of the display panel gradually increases.

According to an embodiment of the application, the encapsulation layer comprises a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked in sequence, and the convex portions are formed on a side of the first inorganic encapsulation layer close to the pixel definition layer.

According to an embodiment of the application, materials of the first inorganic encapsulation layer and the second inorganic encapsulation layer both comprise at least one of silicon nitride or silicon oxide.

An embodiment of the present application also provides a display device including a display panel. The display panel includes:

-   -   a pixel definition layer provided with a plurality of concave         portions; and     -   an encapsulation layer disposed on the pixel definition layer,         wherein a side of the encapsulation layer close to the pixel         definition layer is provided with a plurality of convex portions         corresponding to the plurality of concave portions, and the         convex portions and the concave portions are fitted with each         other to form an interlocking structure.

According to an embodiment of the application, an aperture of each of the concave portions gradually increases in a thickness direction of the display panel; or the aperture of each of the concave portions first gradually increases and then gradually decreases, and a size of the convex portions is adapted to the aperture of the concave portions.

According to an embodiment of the application, in a thickness direction of the display panel, a depth of the concave portions is less than or equal to a thickness of the pixel definition layer.

According to an embodiment of the application, the display panel further comprises a flat layer disposed on a side of the pixel definition layer away from the encapsulation layer, and the flat layer is provided with a plurality of extension portions corresponding to the plurality of concave portions, wherein:

-   -   in the thickness direction of the display panel, the concave         portions penetrate the pixel definition layer; the extension         portions and the concave portions communicate with each other at         an interface between the pixel definition layer and the flat         layer; and the convex portions, the concave portions, and the         extension portions are fitted with each other to form the         interlocking structure.

According to an embodiment of the application, in the thickness direction of the display panel, a depth of the extension portions is less than or equal to a thickness of the flat layer.

According to an embodiment of the application, the display panel further comprises a display area and a non-display area surrounding the display area, and a plurality of the concave portions are at least arranged on a peripheral edge of the display area close to the non-display area.

Beneficial effects of embodiments of the present disclosure are that: embodiments of the present application provide a display panel and a display device. The display panel includes a pixel definition layer and an encapsulation layer. The pixel definition layer is provided with a plurality of concave portions, the encapsulation layer is provided on the pixel definition layer, wherein a side of the encapsulation layer close to the pixel definition layer is provided with a plurality of convex portions corresponding to the plurality of concave portions, and the convex portions and the concave portions are fitted with each other to form an interlocking structure, so as to improve an adhesion between the encapsulation layer and the pixel definition layer. Therefore, a risk of film debonding and separation among the encapsulation layer, the pixel definition layer, and the functional layer is reduced.

DESCRIPTION OF DRAWINGS

In order to explain technical solutions in embodiments or conventional technologies more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some of the disclosed embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is a schematic diagram of a film lamination structure of a first display panel provided by an embodiment of the application;

FIG. 2 is a schematic diagram of a film lamination structure of a second display panel provided by an embodiment of the application;

FIG. 3 is a schematic diagram of a planar structure of a display panel provided by an embodiment of the application;

FIG. 4 is a schematic diagram of a planar structure of a display area provided by an embodiment of the application;

FIG. 5 is a schematic diagram of a film lamination structure of a third display panel provided by an embodiment of the application; and

FIG. 6 is a schematic diagram of a film lamination structure of a fourth display panel provided by an embodiment of the application.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The description of following embodiments refers to the attached drawings to illustrate specific embodiments that the present disclosure can be implemented. Directional terms mentioned in this disclosure, such as “top”, “bottom”, “front”, “rear”, “left”, “right”, “inside”, “outside”, “side”, etc., only refer to the direction of the attached drawings. Therefore, the directional terms used are used to illustrate and understand the present disclosure, rather than to limit the present disclosure. In the figures, units with similar structures are indicated by the same reference numerals.

The disclosure will be further described below in conjunction with the drawings and specific embodiments:

An embodiment of the present application provides a display panel, which will be described in detail below with reference to FIG. 1 to FIG. 6 . The display panel 100 provided by the embodiment of the present application includes a pixel definition layer 10 and an encapsulation layer 11. A plurality of concave portions 101 are provided on the pixel definition layer 10, and a side of the encapsulation layer 11 close to the pixel definition layer 10 is provided with a plurality of convex portions 111 corresponding to the plurality of concave portions 101, and the convex portions 111 and the concave portions 101 are fitted with each other to form an interlocking structure. The interlocking structure formed by the convex portions 111 and the concave portions 101 improves an adhesion between the pixel definition layer 10 and the encapsulation layer 11. Therefore, without affecting an encapsulation effect of the encapsulation layer 11, a risk of film debonding and separation among the encapsulation layer 11, the pixel definition layer 10, and other functional layers is reduced.

In an embodiment of the present application, as shown in FIG. 1 , FIG. 1 is a schematic diagram of a film lamination structure of a first display panel provided by an embodiment of the present application. The display panel 100 is an OLED display panel. The display panel includes: a base substrate 12; and a barrier layer 13, a buffer layer 14, a driving circuit layer 15, a flat layer 16, a pixel definition layer 10, a spacer 18, a light emitting device layer 17, and an encapsulation layer 11, all of which are disposed on the base substrate 12.

Specifically, the driving circuit layer 15 includes an active layer 151, a first gate insulating layer 152, a first metal layer 153, a second gate insulating layer 154, and a second gate insulating layer 151, a metal layer 155, an interlayer dielectric layer 156, and a third metal layer 157, all of which are sequentially stacked on the buffer layer 14. A plurality of patterned first gate electrodes GE1 and a plurality of scan signal lines arranged at intervals are formed in the first metal layer 153. A plurality of patterned second gates GE2 and a plurality of scan signal lines arranged at intervals are formed in the second metal layer 155. The first gate GE1 and the second gate GE2 are aligned to form a storage capacitor of the pixel driving circuit. A plurality of patterned source electrodes 158 and drain electrodes 159 are formed in the third metal layer 157. The source electrodes 158 and the drain electrodes 159 are respectively connected to a source contact area and a drain contact area of the active layer 151 through vias that penetrate the interlayer dielectric layer 156, the second gate insulating layer 154, and the first gate insulating layer 152.

The light emitting device layer 17 includes an anode 171, a light emitting layer 172, and a cathode 173. The anode 171 is arranged between the flat layer 16 and the pixel defining layer 10, and a plurality of pixel openings 102 are arranged on the pixel defining layer 10, and the pixel openings 102 expose the anode 171. The light emitting layer 172 is disposed on the anode 171 and located in the pixel opening 102. The cathode 173 covers the light emitting layer 172 and part of the pixel definition layer 10, and the encapsulation layer 11 covers the cathode 173 and the pixel definition layer 10.

The light emitting device layer 17 further includes a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer (not shown) stacked in a direction from the anode 171 to the cathode 173. The hole injection layer, the hole transport layer, the electron transport layer, and the electron injection layer are all prepared by a whole surface evaporation process. The hole injection layer also covers the pixel definition layer 10 while covering the anode 171. The hole transport layer covers the hole injection layer. The light emitting layer 172 is located on a side of the hole transport layer in each pixel opening 102 away from the anode 171. The electron transport layer covers the light emitting layer 172 and the hole transport layer. The electron injection layer covers the electron transport layer, and the cathode 173 covers the electron transport layer.

It is noted that FIG. 1 only schematically illustrates the structure of the pixel definition layer 10 and the encapsulation layer 11 of the display panel 100. In practical applications, the structures of the driving circuit layer 15 and the light emitting device layer 17 are not limited to the structure shown in FIG. 1 , and may also be other existing known driving circuit structures and light emitting device structures.

Specifically, in an embodiment of the present application, as shown in FIG. 1 , the encapsulation layer 11 includes a first inorganic encapsulation layer 112, an organic encapsulation layer 113, and a second inorganic encapsulation layer 114, all of which are stacked in sequence. The convex portions 111 are formed on a side of the first inorganic encapsulation layer 112 close to the pixel definition layer 10. It can be understood that the convex portions 111 are a part of the first inorganic encapsulation layer 112. When the first inorganic encapsulation layer 112 is deposited and formed, the inorganic material deposited in the concave portions 101 form the convex portions 111, and the material deposited on the surface of the cathode 173 away from the pixel definition layer 10 forms the first inorganic encapsulation layer 112.

In practical applications, a structure of the encapsulation layer 11 is not limited to a stacked structure of the first inorganic encapsulation layer 112, the organic encapsulation layer 113, and the second inorganic encapsulation layer 114 shown in FIG. 1 in the above embodiment. It may also be a single-layer or double-layer inorganic encapsulation layer, or a laminated structure formed of three or more inorganic encapsulation layers and organic encapsulation layers.

Further, materials of the first inorganic encapsulation layer 112 and the second inorganic encapsulation layer 114 both include at least one of silicon nitride and silicon oxide.

In an embodiment of the present application, the first inorganic encapsulation layer 112 and the second inorganic encapsulation layer 114 are both formed of silicon nitride and silicon oxide materials. Both silicon nitride and silicon oxide are inorganic materials, which have a good ability to block water vapor and oxygen, so that a encapsulating effect of the encapsulation layer 11 can be ensured. Material of the organic encapsulation layer 113 is a transparent organic substance, which can effectively improve a bending resistance of the encapsulation layer 11 and avoid cracks in the encapsulation layer 11 during the bending process, which affects the encapsulation effect of the encapsulation layer 11. In practical applications, the first inorganic encapsulation layer 112 may also be formed of silicon nitride, silicon oxide, or other inorganic materials. Material of the second inorganic encapsulation layer 114 and material of the first inorganic encapsulation layer 112 may be the same or different.

Further, in a thickness direction of the display panel 100, an aperture of each concave portion 101 gradually increases; or, an aperture of each concave portion 101 first gradually increases and then gradually decreases, and a size of the convex portion 111 is adapted to the aperture of the concave portion 101.

In an embodiment of the present application, as shown in FIG. 1 , in a thickness direction of the display panel 100, an aperture of the concave portion 101 gradually increases from the surface of the pixel defining layer 10 to the inside of the pixel defining layer 10, and then gradually decreases. Correspondingly, a diameter of the convex portion 111 first gradually increases, and then gradually decreases, so that a diameter of the convex portion 111 inside the concave portion 101 is larger than an opening size of the concave portion 101 on the surface of the pixel definition layer 10, so that this can make it difficult for the convex portion 111 to escape from the concave portion 101, and improve a firmness of the interlocking structure formed by the convex portion 111 and the concave portion 101. Therefore, the adhesion between the pixel definition layer 10 and the encapsulation layer 11 is further increased, and the risk of film debonding and separation between the encapsulation layer 11 and the pixel definition layer 10 and other functional layers is reduced.

In practical applications, in the thickness direction of the display panel 100, the aperture of the concave portion 101 may also gradually increase or decrease. In this way, an interlocking structure can also be formed with the convex portion 111 to achieve the effect of increasing the adhesion between the pixel definition layer 10 and the encapsulation layer 11.

Specifically, as shown in FIG. 1 , the concave portion 101 has a fan shape in a cross section perpendicular to the display panel 100. In practical applications, the cross-sectional shape of the concave portion 101 perpendicular to the display panel 100 is not limited to the sector shape in the above embodiment, and may also be a semicircle, an ellipse, an inverted trapezoid, a trapezoid, or a rectangle.

Further, in a thickness direction of the display panel 100, a depth of the concave portion 101 is less than or equal to a thickness of the pixel definition layer 10.

In an embodiment of the present application, as shown in FIG. 1 , a depth of the concave portion 101 is smaller than a thickness of the pixel definition layer 10. During a manufacturing process, after the pixel definition layer 10 is formed, a plurality of concave portions 101 may be formed on the pixel definition layer 10 through an etching process, and then a hole injection layer, a hole transport layer, a light emitting layer 172, an electron transport layer, an electron injection layer, and a cathode 173 are sequentially deposited and formed on the pixel definition layer 10. The hole injection layer, the hole transport layer, the electron transport layer, the electron injection layer, and the cathode 173 are all fabricated and formed by a whole surface evaporation process. When forming the above-mentioned film layers, the above-mentioned film layers are also deposited and formed in the concave portion 101. FIG. 1 only shows that the cathode 173 is formed in the concave portion 101. The hole injection layer, hole transport layer, electron transport layer, and electron injection layer formed in the concave portion 101 are not shown.

It can be understood that since the depth of the concave portion 101 in the thickness direction of the display panel is much greater than a sum of thicknesses of the hole injection layer, hole transport layer, electron transport layer, electron injection layer, and cathode 173, Therefore, even if the above-mentioned film layers are deposited and formed in the concave portion 101, an influence on the interlocking structure formed by the concave portion 101 and the convex portion 111 can be ignored.

In practical applications, the depth of the concave portion 101 may also be equal to the thickness of the pixel definition layer 10, that is, the concave portion 101 penetrates the pixel definition layer. In this way, the depth of the concave portion 101 can further improve the adhesion between the pixel definition layer 10 and the encapsulation layer 11.

Further, the display panel 100 includes a flat layer 16, the flat layer 16 is disposed on the side of the pixel definition layer 10 away from the encapsulation layer 11, and a plurality of extension portions 161 corresponding to the plurality of concave portions 101 are provided on the flat layer 16, wherein: in a thickness direction of the display panel 100, the concave portion 101 penetrates the pixel definition layer 10, the extension portion 161 and the concave portion 101 communicate with each other at the interface between the pixel definition layer 10 and the flat layer 16, and the convex portion 111, the concave portion 101 and the extension portion 161 are fitted with each other to form the interlocking structure.

As shown in FIG. 2 , FIG. 2 is a schematic diagram of the film lamination structure of a second display panel provided by an embodiment of the application. The structure of the second display panel shown in FIG. 2 is roughly the same as the structure of the first display panel shown in FIG. 1 , except that the flat layer 16 in the second display panel shown in FIG. 2 is provided with a plurality of extension portions 161 corresponding to the plurality of concave portions 101. In the thickness direction of the display panel 100, the concave portion 101 penetrates the pixel definition layer 10, the extension portion 161 extends from the side surface of the flat layer 16 close to the pixel definition layer 10 in the direction of the base substrate 12, and the opening size of the extension 161 is larger than the opening size of the concave portion 101. The concave portion 101 and the extension portion 161 communicate at an interface between the pixel definition layer 10 and the flat layer 16, the convex portion 111 fills the concave portion 101 and the extension portion 161, and the concave portion 101 and the extension 161 are fitted with each other to form an interlocking structure.

It should be noted that the extension portion 161 can be regarded as a portion of the concave portion 101 extending toward the flat layer 16. In this way, by increasing a depth of the interlocking structure, the adhesion between the encapsulation layer 11 and the pixel definition layer 10 and other functional layers can be further increased. Therefore, a risk of film debonding and separation between the encapsulation layer 11 and the pixel definition layer 10 and other functional layers is reduced.

In an actual manufacturing process, the pixel definition layer 10 may be etched to form a concave portion 101 penetrating the pixel definition layer 10 first, and the concave portion 101 exposes the flat layer at the bottom of the pixel definition layer 10. On a basis of the concave portion 101, the flat layer 16 is etched to form an extension 161. Since the extension 161 is formed after the manufacturing process of the pixel definition layer 10, the manufacturing process of the extension 161 does not affect a flatness of a surface of the pixel definition layer 10, thereby ensuring the planarization function of the flat layer 16.

Further, in the thickness direction of the display panel 100, a depth of the extension 161 is less than or equal to a thickness of the flat layer 16.

In an embodiment of the present application, as shown in FIG. 2 , in a thickness direction of the display panel 100, a depth of the extension 161 is smaller than the thickness of the flat layer 16. That is, the extension portion 161 extends from a side surface of the flat layer 16 close to the pixel definition layer 10 into the flat layer 16. In practical applications, the extension portion 161 is not limited to extending into the flat layer 16 and can also penetrate the flat layer 16.

Further, the display panel 100 includes a display area A1 and a non-display area A2 surrounding the display area A1, and a plurality of the concave portions 101 are at least disposed on a peripheral edge of the display area A1 close to the non-display area A2.

In an embodiment of the present application, in conjunction with FIG. 1 and FIG. 3 , FIG. 3 is a schematic diagram of a planar structure of the display panel 100 provided by an embodiment of the present application. The display panel 100 includes a display area A1, a non-display area A2 surrounding the display area A1, and an encapsulation layer 11 covers the display area A1. The concave portion 101 is disposed on the peripheral edge of the display area A1 close to the non-display area A2. Correspondingly, the convex portion 111 is also disposed on the peripheral edge of the portion of the encapsulation layer corresponding to the display area A1 close to the non-display area A2. In this way, the adhesion between the encapsulation layer 11 and the pixel definition layer 10 located on the peripheral edge of the display area A1 can be improved.

It should be noted that during a manufacturing process of the display panel 100, components such as a polarizer and a cover plate need to be adhered on the surface of the encapsulation layer 11, and protective films are adhered on the surfaces of the above components. After the above components are pasted, the protective film on the surface of each component needs to be peeled off. In a process of tearing the film, the encapsulation layer 11 is prone to film debonding and separation from the cathode 173 and the pixel definition layer 10 and other film layers. The debonding and separation of the film layer mainly occur from the peripheral edges of the display panel 100. In the display panel shown in FIG. 1 , the encapsulation layer 11 only covers the display area A1, and the non-display area A2 is not provided with an encapsulation layer. Therefore, an interlocking structure formed by the convex portion 111 and the concave portion 101 is provided on the peripheral edge of the display area A1 close to the non-display area A2, which is beneficial to improve the adhesion between the encapsulation layer 11 and the pixel definition layer 10 located on the peripheral edge of the display area A1. Therefore, a risk of debonding and separation of the film layer in the subsequent manufacturing process of the display panel is reduced.

In practical applications, the concave portion 101 is not limited to being provided on the peripheral edge of the display area A1 close to the non-display area A2, but may also be provided in various areas within the display area A1. In this way, the adhesion between the encapsulation layer 11 and the various regions of the pixel definition layer 10 can be further increased, and the risk of film debonding and separation among the encapsulation layer 11, the pixel definition layer 10, and other functional layers can be further reduced.

Further, the display area A1 is provided with a plurality of light emitting units 110 distributed in an array, and the concave portion 101 is arranged at least partly between the adjacent light emitting units.

In an embodiment of the present application, as shown in FIG. 4 , FIG. 4 is a schematic diagram of the planar structure of the display area A1 provided by an embodiment of the present application. The display area A1 is provided with a plurality of light emitting units 110 distributed in an array. A portion of the pixel definition layer 10 corresponding to the display area A1 is provided with a plurality of pixel openings 102 corresponding to the plurality of light emitting units 110. The pixel opening 102 penetrates the pixel definition layer 10. The light emitting unit 110 is disposed in the pixel opening 102. Each of the light emitting units 110 includes an anode 171, a light emitting layer 172, and a cathode 173, all of which are stacked in sequence.

It should be noted that FIG. 4 only illustrates a distribution area of the concave portion 101 in the display area A1. Although FIG. 4 only shows that the display area A1 is provided with a circle of the concave portions 101 near the peripheral edge of the non-display area A2, number and density ratio of the concave portions 101 shown in FIG. 4 do not represent number and density of the concave portions 101 in practical applications.

Specifically, in an embodiment of the present application, the plurality of light emitting units 110 include a red light emitting unit 1101, a green light emitting unit 1102, and a blue light emitting unit 1103. Through a mutual combination of the red light emitting unit 1101, the blue light emitting unit 1103, and the green light emitting unit 1102, a full-color screen display of the display panel 100 can be realized. In practical applications, a color of the light emitting unit 110 is not limited to the combination of the red light emitting unit 1101, the green light emitting unit 1102, and the blue light emitting unit 1103 in the foregoing embodiment, and may also be other colors. In addition, a shape of the plurality of light emitting units 110 is not limited to the square shape shown in FIG. 4 , and may also be rectangular, diamond, circular, oval, or the like.

Further, one concave portion 101 is provided between adjacent light emitting units 110; or, a plurality of concave portions 101 distributed continuously or at intervals are provided between adjacent light emitting units 110.

Further, the areas of the red light emitting unit 1101, the blue light emitting unit 1103 and the green light emitting unit 1102 are different from each other. On a plane where the side surface of the pixel definition layer 10 close to the encapsulation layer 11 is located, an opening area of the concave portion 101 is greater than or equal to a minimum value of an area of the red light emitting unit 1101, the green light emitting unit 1102, and the blue light emitting unit 1103, and is less than or equal to a maximum value of the area in the red light emitting unit 1101, the green light emitting unit 1102, and the blue light emitting unit 1103. It should be noted that, the areas of the red light emitting unit 1101, the blue light emitting unit 1103, and the green light emitting unit 1102 are the opening area of the pixel opening 102 corresponding to each light emitting unit 110 on the plane where the side surface of the pixel definition layer 10 close to the encapsulation layer 11 is located. In an embodiment of the present application, as shown in FIG. 4 , a concave portion 101 is provided between adjacent light emitting units 110, the area of the green light emitting unit 1102 is the smallest, the area of the red light emitting unit 1101 is secondary, and the area of the blue light emitting unit 1103 has the largest area. On the plane where the side surface of the pixel definition layer 10 close to the encapsulation layer 11 is located, the opening area of the concave portion 101 is greater than or equal to the area of the green light emitting unit 1102 and less than or equal to the area of the blue light emitting unit 1103.

It should be noted that since the opening area of each pixel opening 102 is very small, if the opening area of the concave portion 101 is smaller than a minimum of the opening area of the pixel opening 102 of each light emitting unit 110, the opening area of the concave portion 101 may be too small. It is not beneficial to the formation of an interlocking structure between the concave portion 101 and the convex portion 111, so that the adhesion between the encapsulation layer 11 and the pixel definition layer 10 cannot be effectively improved. At the same time, the concave portion 101 and the pixel opening 102 of each light emitting unit 110 are both formed on the pixel defining layer 10, and the concave portion 101 is prepared by using the non-light emitting area between the light emitting units 110. If the opening area of the concave portion 101 is greater than the maximum of the opening area of the pixel opening 102 of each light emitting unit 110, the concave portion 101 may interfere with the adjacent light emitting unit 110, thereby exposing the anode 171 at a bottom of the adjacent light emitting unit 110. The hole injection layer, the hole transport layer, the electron transport layer, the electron injection layer, and the cathode 173 deposited in the concave portion 101 may contact the anode 171, which may affect the electrical performance of the light emitting device. In this way, interference with the concave portion 101 can only be avoided by reducing the opening area of the pixel opening 102 of the light emitting unit 110, but this will reduce the opening area of the light emitting unit 110 adjacent to the concave portion 101, resulting in a decrease in the brightness of the display panel 100. It can be seen that by defining the opening area of the concave portion 101 to be between the minimum and maximum of the area of the pixel opening 102 of each pixel unit 110, the adhesion between the encapsulation layer 11 and the pixel definition layer 10 can be increased. At the same time, it is avoided that the opening area of the concave portion 101 is too large to compress an area of each adjacent light emitting unit 110, thereby ensuring the display effect of the display panel 100.

In practical applications, a size relationship among the red light emitting unit 1101, the green light emitting unit 1102, and the blue light emitting unit 1103 is not limited to the above-mentioned size relationship. It may also be that the area of the green light emitting unit 1102 is the largest, the red light emitting unit 1101 is the secondary, and the area of the blue light emitting unit 1103 is the smallest. The size relationship among the red light emitting unit 1101, the green light emitting unit 1102, and the blue light emitting unit 1103 can be set according to requirements, and there is no limitation here.

Further, on a plane where a side surface of the pixel definition layer close to the encapsulation layer 11 is located, a ratio of the opening area of the concave portion 101 to the maximum area of the red light emitting unit 1101, the green light emitting unit 1102, and the blue light emitting unit 1103 is greater than or equal to 0.25 and less than or equal to 1. In order to balance a light emitting life of each light emitting unit 110, a current of the light emitting unit 110 with lower luminous efficiency can be reduced by increasing the area of the light emitting unit 110 with lower luminous efficiency, so as to achieve the same luminous life as the light emitting unit 110 with higher luminous efficiency. Generally, an area ratio of the light emitting unit with the highest luminous efficiency to the light emitting unit with the lowest luminous efficiency is set to 0.25. It can be understood that by limiting the ratio of the opening area of the concave portion 101 to the maximum area of each light emitting unit 110 to be greater than or equal to 0.25, it can be ensured that the area of the concave portion 101 is greater than or equal to the minimum opening area of each light emitting unit 110. In this way, it is ensured that the concave portion 101 and the convex portion 111 can form an interlocking structure, thereby improving the adhesion between the encapsulation layer 11 and the pixel definition layer 10. By limiting the ratio of the opening area of the concave portion 101 to the maximum area of each light emitting unit 110 to be less than or equal to 1, a certain distance is maintained between the concave portion 101 and each light emitting unit 110, so as to avoid interference between the concave portion 101 and the adjacent light emitting unit 110. In this way, it is ensured that the opening area of each light emitting unit 110 is not affected by the concave portion 101.

In an embodiment of the present application, on the plane where the side surface of the pixel definition layer 10 close to the encapsulation layer 11 is located, the ratio of the opening area of the concave portion 101 to the area of the blue light emitting unit 1103 is 0.5. In practical applications, the ratio of the opening area of the concave portion 101 to the area of the blue light emitting unit 1103 is not limited to 0.5, and can also be 0.25, 0.4, 0.6, 0.8, or 1, etc.

In some other embodiments, as shown in FIG. 5 , FIG. 5 is a schematic diagram of a film lamination structure of the third display panel provided by an embodiment of the present application. A plurality of concave portions 101 are provided between adjacent light emitting units 110, and the plurality of concave portions 101 are continuously distributed, and correspondingly, the convex portions 111 are also continuously distributed. In this way, by increasing number of concave portions 101 and convex portions 111 between adjacent light emitting units 110, the adhesion between the encapsulation layer 11 and the pixel definition layer 10 in each local area in the display area A1 can be further improved. In practical applications, a distribution mode of the plurality of concave portions 101 between adjacent light emitting units 110 is not limited to a continuous part, and may also be distributed at intervals.

Further, the non-display area A2 is provided with a plurality of the concave portions 101 around the periphery of the display area A1.

In an embodiment of the present application, as shown in FIG. 6 , FIG. 6 is a schematic diagram of the film lamination structure of a fourth display panel provided by an embodiment of the present application. The structure of the fourth display panel shown in FIG. 6 is roughly the same as the film structure of the display panel shown in FIG. 1 , except that: in the fourth display panel 100 shown in FIG. 6 , the encapsulation layer 11 covers part of the non-display area A2 while covering the display area A1; a portion of the pixel definition layer 10 corresponding to the non-display area A2 is also provided with a plurality of the concave portions 101; the encapsulation layer 11 corresponds to the part of the non-display area A2 and is close to the pixel definition layer 10 with a plurality of convex portions 111; the concave portion 101 and the convex portion 111 are fitted with each other to form an interlocking structure, and the concave portion 101 is disposed on the periphery of the non-display area A2 close to the display area A1. In this way, the adhesion between the pixel definition layer 10 and the encapsulation layer 11 around the non-display area A2 can be further improved. Since the film debonding mainly starts from the peripheral edges of the display panel 100, by adding a concave portion 101 and a convex portion 111 corresponding to the concave portion 101 around the non-display area A2, the interlocking structure formed by the convex portion 111 and the concave portion 101 can improve the adhesion between the pixel definition layer 10 and the encapsulation layer 11 around the non-display area A2. When attaching polarizers and cover plates to the display panel, in a process of tearing the film, since the non-display area A2 is provided with an interlocking structure on the periphery of the non-display area A2, the encapsulation layer 11 located in the non-display area A2 is not easily separated from the pixel definition layer 10, which further reduces a risk of film layer debonding and separation between the encapsulation layer 11 and the pixel definition layer 10 and other functional layers.

Further, in a direction in which a center of the display area A1 points to the non-display area A2, at least one of the following features is gradually increased: the density of the plurality of concave portions 101; the opening size of the plurality of concave portions 101 on the plane where the pixel definition layer 10 is located; or the plurality of concave portions 101 are in the depth in the thickness direction of the display panel 100.

In an embodiment of the present application, taking the fourth display panel shown in FIG. 6 as an example, both the display area A1 and the non-display area A2 are provided with the concave portion 101 and the convex portion 111. In a direction in which the center of the display area A1 points to the non-display area A2, the opening sizes of the plurality of concave portions 101 in the plane where the pixel definition layer 10 is located gradually increase. That is, the opening area of the concave portion 101 gradually increases; a density of a plurality of concave portions 101 is the same; and a depth of the plurality of concave portions 101 in the thickness direction of the display panel 100 is also the same. The adhesion force of the interlocking structure is proportional to the opening area of the concave portion 101. In this way, the adhesion force between the encapsulation layer 11 and the pixel definition layer 10 can gradually increase in a direction from a middle of the display area A1 to the non-display area A2, so as to deal with the gradually increasing stress in the direction of the non-display area A2 in the middle of the display area A1, which further reduces the risk of film layer debonding and separation between the encapsulation layer 11 and the pixel definition layer 10 and other functional layers.

In practical applications, it can also be limited in that: in the direction in which a center of the display area A1 points to the non-display area A2, the opening sizes of the plurality of concave portions 101 on the plane where the pixel definition layer 10 is located are all the same, the depth of the plurality of concave portions 101 in the thickness direction of the display panel 100 is also the same, and a density of the plurality of concave portions 101 gradually increases; or, in the direction in which the center of the display area A1 points to the non-display area A2, the opening sizes of the plurality of concave portions 101 on the plane where the pixel definition layer 10 is located are all the same, the density of a plurality of the concave portions 101 is the same, the depth of the plurality of concave portions 101 in the thickness direction of the display panel 100 gradually increases; or, at least two of the above three features gradually increase in the direction from the center of the display area A1 to the non-display area A2. In this way, the adhesive force between the encapsulation layer 11 and the pixel definition layer 10 can gradually increase in the direction from the middle of the display area A1 to the non-display area A2, so as to deal with the problem in the display area A1. The middle points to the gradually increasing stress in the direction of the non-display area A2. In this way, the adhesive force between the encapsulation layer 11 and the pixel definition layer 10 can be gradually increased in the direction from the middle of the display area A1 to the non-display area A2. Therefore, the stress gradually increasing in the direction toward the non-display area A2 in the middle of the display area A1 is dealt with.

An embodiment of the present application also provides a display device, the display device includes a display panel, and the display panel may be the display panel 100 provided in the foregoing embodiment. In addition, the display panel in the display device provided in the embodiment of the present application can achieve the same technical effect as the display panel 100 provided in the above-mentioned embodiment, which will not be repeated here.

Embodiments of the present application provide a display panel and a display device. The display panel includes: a pixel definition layer provided with a plurality of concave portions; and an encapsulation layer provided on the pixel definition layer, wherein a side of the encapsulation layer close to the pixel definition layer is provided with a plurality of convex portions corresponding to the plurality of concave portions, and the convex portions and the concave portions are fitted with each other to form an interlocking structure, so as to improve an adhesion between the encapsulation layer and the pixel definition layer. Therefore, a risk of film debonding and separation among the encapsulation layer, the pixel definition layer, and the functional layer is reduced.

From above, although the present application is disclosed as above in preferred embodiments, the above preferred embodiments are not intended to limit the application. Those of ordinary skill in the art can make various changes and modifications without departing from the spirit and scope of this application. Therefore, the scope of protection of this application is based on the scope defined by the claims. 

1. A display panel, comprising: a pixel definition layer provided with a plurality of concave portions; and an encapsulation layer disposed on the pixel definition layer, wherein a side of the encapsulation layer close to the pixel definition layer is provided with a plurality of convex portions corresponding to the plurality of concave portions, and the convex portions and the concave portions are fitted with each other to form an interlocking structure.
 2. The display panel according to claim 1, wherein an aperture of each of the concave portions gradually increases in a thickness direction of the display panel; or the aperture of each of the concave portions first gradually increases and then gradually decreases, and a size of the convex portions is adapted to the aperture of the concave portions.
 3. The display panel according to claim 1, wherein in a thickness direction of the display panel, a depth of the concave portions is less than or equal to a thickness of the pixel definition layer.
 4. The display panel according to claim 3, further comprising a flat layer disposed on a side of the pixel definition layer away from the encapsulation layer, and the flat layer is provided with a plurality of extension portions corresponding to the plurality of concave portions, wherein: in the thickness direction of the display panel, the concave portions penetrate the pixel definition layer; the extension portions and the concave portions communicate with each other at an interface between the pixel definition layer and the flat layer; and the convex portions, the concave portions, and the extension portions are fitted with each other to form the interlocking structure.
 5. The display panel according to claim 4, wherein in the thickness direction of the display panel, a depth of the extension portions is less than or equal to a thickness of the flat layer.
 6. The display panel according to claim 1, further comprising a display area and a non-display area surrounding the display area, and a plurality of the concave portions are at least arranged on a peripheral edge of the display area close to the non-display area.
 7. The display panel according to claim 6, wherein a plurality of light emitting units distributed in an array are arranged in the display area, and the concave portions is arranged at least partly between the adjacent light emitting units.
 8. The display panel according to claim 7, wherein the light emitting units include a red light emitting unit, a green light emitting unit, and a blue light emitting unit, and the red light emitting unit and the blue light emitting unit and the green light emitting unit have different areas, wherein on a plane where a side surface of the pixel definition layer close to the encapsulation layer is located, an opening area of the concave portions is greater than or equal to a minimum value of an area of the red light emitting unit, the green light emitting unit, and the blue light emitting unit, and is less than or equal to a maximum value of the area of the red light emitting unit, the green light emitting unit, and the blue light emitting unit.
 9. The display panel according to claim 8, wherein on the plane where the side surface of the pixel definition layer close to the encapsulation layer is located, a ratio of the opening area of the concave portions to the maximum value of the area of the red light emitting unit, the green light emitting unit, and the blue light emitting unit is greater than or equal to and less than or equal to
 1. 10. The display panel according to claim 7, wherein one of the concave portions is provided between adjacent light emitting units; or, the plurality of concave portions are distributed continuously or at intervals between the adjacent light emitting units.
 11. The display panel according to claim 6, wherein the non-display area is provided with the plurality of concave portions on a periphery of the display area.
 12. The display panel according to claim 6, wherein in a direction in which a center of the display area points to the non-display area, at least one of a density of the plurality of concave portions, an opening size of the plurality of concave portions in the plane where the pixel definition layer is located, or a depth of the plurality of concave portions in a thickness direction of the display panel gradually increases.
 13. The display panel according to claim 1, wherein the encapsulation layer comprises a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked in sequence, and the convex portions are formed on a side of the first inorganic encapsulation layer close to the pixel definition layer.
 14. The display panel according to claim 13, wherein materials of the first inorganic encapsulation layer and the second inorganic encapsulation layer both comprise at least one of silicon nitride or silicon oxide.
 15. A display device, comprising a display panel, wherein the display panel comprises: a pixel definition layer provided with a plurality of concave portions; and an encapsulation layer disposed on the pixel definition layer, wherein a side of the encapsulation layer close to the pixel definition layer is provided with a plurality of convex portions corresponding to the plurality of concave portions, and the convex portions and the concave portions are fitted with each other to form an interlocking structure.
 16. The display device according to claim 15, wherein an aperture of each of the concave portions gradually increases in a thickness direction of the display panel; or the aperture of each of the concave portions first gradually increases and then gradually decreases, and a size of the convex portions is adapted to the aperture of the concave portions.
 17. The display device according to claim 15, wherein in a thickness direction of the display panel, a depth of the concave portions is less than or equal to a thickness of the pixel definition layer.
 18. The display device according to claim 17, wherein the display panel further comprises a flat layer disposed on a side of the pixel definition layer away from the encapsulation layer, and the flat layer is provided with a plurality of extension portions corresponding to the plurality of concave portions, wherein: in the thickness direction of the display panel, the concave portions penetrate the pixel definition layer; the extension portions and the concave portions communicate with each other at an interface between the pixel definition layer and the flat layer; and the convex portions, the concave portions, and the extension portions are fitted with each other to form the interlocking structure.
 19. The display device according to claim 18, wherein in the thickness direction of the display panel, a depth of the extension portions is less than or equal to a thickness of the flat layer.
 20. The display device according to claim 15, wherein the display panel further comprises a display area and a non-display area surrounding the display area, and a plurality of the concave portions are at least arranged on a peripheral edge of the display area close to the non-display area. 